T98: [sftp] Add support for posix-rename@openssh.com

Originally reported by asn: https://bugs.libssh.org/T98

We should add support for posix-rename@openssh.com which supports renaming with atomic posix semantics.

sftp_rename() should use this extension by default if the sftp supports it.

Jakuje commented on 2018-10-09 12:51:04 UTC:

This landed in 6c56c1e0

But it is not yet supported in client (sftp_rename()) by default.

asn commented on 2018-10-09 12:55:38 UTC:

We need it on the client side in sftp_rename()